Rotary tool accessories high speed steel saw blade 7-piece set includes four 36-tooth blades from 7/8 to 1-1/2 inch diameter, one 1-3/4 inch diameter blade for finer cuts, and two 1/4 inch mandrels with 1/8 inch shanks. Each saw blade is constructed of high speed steel for ultimate durability. This rotary saw blade set is ideal for precision cuts great for any garage or workshop. For use on wood, plastic, and other soft materials. Maximum RPM: 20000 RPM.